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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

25850 results found.

  1. Swift-XRT improved positions, and new redshift limits.
  2. ESO optical and NIR observations of GRB 080218B
  3. GRB 080204: Suzaku WAM observation of the prompt emission
  4. GRB 080218B, Swift-BAT refined analysis
  5. GRB 080218B: Swift-XRT refined analysis
  6. Swift/UVOT observations of GRB080218B
  7. GRB 080218B: REM NIR early upper limits
  8. GRB 080218B: Enhanced Swift-XRT position
  9. GRB 080218B: GROND upper limits
  10. GRB 080218A, Swift-BAT refined analysis
  11. GRB 080211: Suzaku WAM observation of the prompt emission
  12. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  13. VLA radio upper limit on GRB 080212
  14. Swift/UVOT refined analysis of GRB080212
  15. GRB 080212, Swift-BAT refined analysis
  16. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  17. GRB 080212: GROND detects afterglow
  18. GRB 080212: REM NIR afterglow?
  19. GRB 080212: Enhanced Swift-XRT position
  20. GRB 080212: Swift-XRT Team refined analysis
  21. GRB 080210: Keck photometry
  22. VLA non-detection of GRB 080210
  23. GRB 080212: Swift detection of a burst
  24. GRB 080207: VLT NIR early upper limits
  25. GRB 080210: Swift/UVOT Refined Analysis
  26. GRB 080210, Swift-BAT refined analysis
  27. GRB 080210: Super-LOTIS observations
  28. GRB 080210: Swift-XRT Refined Analysis
  29. GRB 080210: Enhanced Swift-XRT position
  30. GRB 080210: GOND detection in all bands and redshift upper limit
  31. GRB080210 - SDSS Pre-Burst Observations
  32. GRB 080210: Swift detection of a burst with optical afterglow
  33. GRB 080210: TAROT La Silla observatory optical detection
  34. GRB 080207: GROND upper limits
  35. GRB 080205: GAO 150cm telescope Optical limit
  36. GRB 080207, Swift-BAT refined analysis
  37. GRB 080207: Optical limits from Gemini-South
  38. Swift detection of AX J1749.1-2639
  39. GRB 080207: Super-LOTIS observations
  40. GRB 080207, Swift-BAT refined analysis
  41. Swift Trigger 302777 is not a GRB
  42. GRB080207: RTT150 Optical Observations
  43. GRB 080207: REM NIR observations
  44. GRB080207: Swift/UVOT refined analysis
  45. GRB 080207: TAROT Calern observatory optical observations
  46. GRB 080207: Swift-XRT Refined Analysis
  47. GRB 080207: Enhanced Swift-XRT position
  48. GRB 080207: Swift detection of a burst
  49. GRB 080205: optical observation
  50. VLA radio upper limit on GRB 080205
  51. INT+WFC R-band observations of GRB 080205
  52. GRB 080205, Swift-BAT refined analysis
  53. IPN localization of very hard GRB 080204
  54. GRB 080205: Swift XRT refined analysis
  55. GRB 080205: Swift/UVOT observations
  56. GRB 080205: Enhanced Swift-XRT position
  57. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  58. GRB 080130: Swift-BAT refined analysis
  59. GRB 080130: further Swift XRT observations confirm fading source
  60. GRB 080129: Swift/UVOT Refined Upper Limits
  61. Swift/UVOT observations of GRB080130
  62. GRB 080130: REM NIR observations
  63. GRB 080130(?): Swift XRT observation
  64. GRB 080129: Swift-XRT refined analysis
  65. GRB 080129: KAIT optical limits
  66. GRB 080129, Swift-BAT refined analysis
  67. GRB 080129: TAROT La Silla observatory optical observations
  68. GRB 080129: GROND detection in all bands, and fading
  69. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  70. GRB 080129: Enhanced Swift-XRT position
  71. GRB 080129: Gemini-South Imaging Observations
  72. GRB 080129 (?): UVOT Upper Limits
  73. A new website of high-level data products for Swift GRBs
  74. GRB 080123 : Suzaku WAM observation of the prompt emission
  75. Transient 080109/SN 2008D: Spectroscopic Evolution
  76. Konus-Wind observation of GRB 080122
  77. GRB 080122 : Suzaku WAM observation of the prompt emission
  78. GRB 080121: Swift/UVOT upper limits
  79. SNe 2008D and 2007uy: Chandra Detections
  80. GRB 080121: Enhanced Swift-XRT position
  81. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  82. IPN triangulation of GRB080122
  83. GRB 080121: Nearby SDSS galaxies
  84. GRB 080123: Swift-XRT refined analysis
  85. GRB 080123: Swift/UVOT refined analysis
  86. GRB 080123, Swift-BAT refined analysis
  87. GRB 080123: Enhanced Swift-XRT position
  88. GRB 080123: Swift detection of a short burst
  89. GRB 080120: GROND confirmation of the optical afterglow
  90. VLA radio upper limit on GRB 080120
  91. GRB 080120: Swift-XRT refined analysis
  92. GRB 080120: GROND detection
  93. GRB080120: Swift XRT position
  94. GRB 080120: a long GRB detected by INTEGRAL
  95. Transient in NGC2770 / SN2008D: Metallicity of nearby HII regions
  96. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  97. XRF 080109 / SN 2008D: UKIRT JHK imaging
  98. optical observations, XRT in NGC 2770
  99. XRF 080109/SN 2008D: PROMPT Optical Imaging
  100. Gemini-South observations of XRF 080109 / SN 2008D

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